Blanket stretcher



Sept. 19, 1933. H. F. SCHMIDT ET AL BLANKET STRETCHER Original FiledMarch 14, 1929 present invention; and

Patented Sept 119, 1933 sin I 1,927,049 V v BLANKET 's'rmrronsn' Hugo'lF. Schmidt and, Louis Jung,

Milwaukee, Wis.

" Griginal application March '14," iezafserial No.

Divided and this application Sen-'1 ternber 2, 1930. Serial No. 4793M.

4 Claims. (Cl. 101-.415 .1)'

This invention relates to a blanket stretcher One of the principalobjects of the present invention is to provide a novel blanke stretcherwhich is incorporated in the printing cylinder and which facilitates theplacing of a uniform tension on the blanket thereby improving itscapacity to effect the transfer printing operation in a superior manner.The tension is applied to the blanket stretcher through a plurality ofadjusting devices such as thumb screws which permits the operator tosense or feel the tension applied to different portions of the blanketthereby insuring the placing of such tensioning force on the differentparts of the blanket as is necessary I to uniformly and properly tensionthe same.

Other objects and advantages residein certain novel features of theconstruction, arrangement.

and combination of parts which will be hereinafter more fully describedand particularly pointed out in the appended claims, reference being hadto the accompanying drawing forming a part of this specification, and inwhich:

Figure 1' is a view partly in longitudinal diametrical section showing aprinting cylinder equipped with a blanket stretcher embodying the Figure2 is a view in transverse section on line 2-2 of Figure 1.

Referring to the drawing, thenurneral 50 designates a printing ortransfer cylinder. As to the manner of mounting and driving the transferor printing cylinder and for an understanding of the instrumentalitieswith which it coacts, reference is made to the copending applicationabove referred to.

The cylinder 50 includes an approximately cylindrical body portion 58and integral end plates 59. The body 58 of the printing cylinder isformed with a gap or opening 60 flanked with inturned flanges 61integral with the body of the cylinder. This provides a flat on thesurface of the cylinder and also is adapted for organization with thenovel form of blanket stretcher to be hereinafter more fully described.

In accordance with the usual practice, a blanket 1201s wrapped aroundthe periphery of the cylinder 50 and is secured and. properly anduniformly tensioned on the cylinder 50 by means of a novel form ofblanket stretcher embodying the present invention.

Each end of the blanket is clamped between an elongated bar 121 ofrectangular cross section and an elongated bar 122 of L-shaped crosssection by means of clamping screws 123 extending through openingsprovided in one flange of 60 the L.'-shaped bar 122 and through openingsin the end of the blanket and threaded into openings found in the bar121. The clamping bars 121 and 122 extend across the ends of the blanketfor substantially the. full width thereof and develop a high degree offriction with the ends of the blanket as they reversely bend the blanketbetween themselves.

An elongated clamping and equalizing plate 125 extends between orstraddles and engages the 70. L-shapecl bars122 for approximately theirfull length and has flaring openings loosely receiving screws 126anchored in a carrier bar 127 secured by stud. bolts 128 to bracket lugs129 formed on the ends-of the cylinder inwardly of 7 thegap oropening'fio'thereof. Wing nuts 130 are threaded'on the screws 126 andbear against the plate 125 so that when'the wing nuts are tightened upthe plate 125 and'bothl sets of clamping bars 121 and 122 are forcedinwardly, the clamping bars 121 sliding along the inturned flanges 61.The clamping and equalizing action of the plate 125 serves to tighten upboth ends of the blanket and to uniformly stretch and tension the same.Moreover, as the clamping plate. bears against the angular clamping bar122 ad- 1 jacent the reverse bends of the blanket ends, the blanket endsare more firmly gripped between the bars 121 and 122 by the pressuresexerted by the clamping plate 125. r

The invention claimed is: r

1. In combination, aprinting cylinder formed with a gap and also havinga blanket wrapped around the cylinder, clamping bars embracing andfrictlonally engaging both ends of the blanket and extending forsubstantially the full width of the blanket ends in the gap, a clampingand equalizing plate extending between and engaged with adjacent bars atthe opposite ends of the blanket for approximately the full length ofsaid bars, and means including a plurality of independently adjustablefastening devices coasting with spaced portions of the plate for forcingthe plate inwardly in such manner as to cause it to apply uniformtensioning force to both ends of the blanket.

2. In combination, a printing cylinder formed. with a gap and alsohaving a blanket wrapped around the cylinder, clamping bars embracing 0and frictionally engaging both ends of the blanket and extending forsubstantially the full width of the blanket ends in the gap, a clampingand equalizing plate extending between and engaged with adjacent bars atthe opposite ends of the blanket for approximately the full length ofsaid bars, and screws anchored within the cylinder and projectingoutwardly through the gap at longitudinally spaced points thereof, saidplate having spaced inwardly flaring openings receiv ing said screws andwing nuts threaded on said screws and engaging said plate.

3. In combination, a printing cylinder formed with a gap and also havinga blanket wrapped around. the cylinder, clamping bars embracing andfrictionally engaging both ends of the blanket within the gap, aclamping and equalizing plate extending between and engaged withadjacent bars at the opposite ends of the blanket for approximately thefull length of said bars, and screws anchored within the cylinder andprojecting outwardly through the gap, said plate having openingsreceiving said screws and nuts threaded on said screws and engaging saidplate. 4:. In combination with a printing cylinder and a blanket wrappedtherearound, a set of clamping bars embracing each end of the blanketand reversely bending the associated end of the blanket between them, atleast one of the bars of each set being an angle bar and having a flangeoverlapping the edge of its cooperable bar, means for forcing the barsof each set into frictional engagement with the blanket and meansconnected to the cylinder and coacting with said flanges of the anglebars of each set for applying a tensioning force to both ends of theblanket;

HUGO F. SCHMIDT.

LOUIS JUNG.

